fix: restore desktop window dragging on remote instances

- Fixes header drag behavior in Desktop when connected to remote hosts
- Routes all window-drag entry points through a shared safe desktop helper
- Keeps local desktop drag behavior unchanged while avoiding remote IPC failures

packages/ui/src/components/layout/Header.tsx

@@ -62,7 +62,7 @@ import type { SessionContextUsage } from '@/stores/types/sessionTypes';
 import { DesktopHostSwitcherDialog } from '@/components/desktop/DesktopHostSwitcher';
 import { OpenInAppButton } from '@/components/desktop/OpenInAppButton';
 import { ProjectActionsButton } from '@/components/layout/ProjectActionsButton';
-import { isDesktopShell, isVSCodeRuntime } from '@/lib/desktop';
+import { isDesktopShell, isVSCodeRuntime, startDesktopWindowDrag } from '@/lib/desktop';
 import { desktopHostsGet, locationMatchesHost, redactSensitiveUrl } from '@/lib/desktopHosts';
 import { resolveSessionDiffStats } from '@/components/session/sidebar/utils';
 import type { Session } from '@opencode-ai/sdk/v2/client';
@@ -1405,13 +1405,7 @@ export const Header: React.FC<HeaderProps> = ({
       return;
     }
     if (isDesktopApp) {
-      try {
-        const { getCurrentWindow } = await import('@tauri-apps/api/window');
-        const window = getCurrentWindow();
-        await window.startDragging();
-      } catch (error) {
-        console.error('Failed to start window dragging:', error);
-      }
+      await startDesktopWindowDrag();
     }
   }, [isDesktopApp]);
 

packages/ui/src/components/layout/RightSidebar.tsx

@@ -1,7 +1,7 @@
 import React from 'react';
 import { cn } from '@/lib/utils';
 import { useUIStore } from '@/stores/useUIStore';
-import { isDesktopShell } from '@/lib/desktop';
+import { isDesktopShell, startDesktopWindowDrag } from '@/lib/desktop';
 
 export const RIGHT_SIDEBAR_CONTENT_WIDTH = 420;
 const RIGHT_SIDEBAR_MIN_WIDTH = 400;
@@ -123,13 +123,7 @@ export const RightSidebar: React.FC<RightSidebarProps> = ({ isOpen, children, cl
       return;
     }
 
-    try {
-      const { getCurrentWindow } = await import('@tauri-apps/api/window');
-      const appWindow = getCurrentWindow();
-      await appWindow.startDragging();
-    } catch (error) {
-      console.error('Failed to start window dragging:', error);
-    }
+    await startDesktopWindowDrag();
   }, [isDesktopApp]);
 
   return (